CN103168224B

CN103168224B - Method preparing coal for coke production

Info

Publication number: CN103168224B
Application number: CN201180050452.5A
Authority: CN
Inventors: 土肥勇介; 下山泉; 深田喜代志; 山本哲也; 角广行
Original assignee: NKK Corp
Current assignee: JFE Steel Corp; JFE Engineering Corp
Priority date: 2010-09-01
Filing date: 2011-08-31
Publication date: 2015-07-15
Anticipated expiration: 2031-08-31
Also published as: EP2613137A4; US9102892B2; WO2012029983A1; AU2011296879B2; JP2012072391A; EP2613137B1; PL2613137T3; RU2013114315A; RU2559471C2; PL3124575T3; JP5071578B2; CN103168224A; EP3124575B1; AU2011296879A1; TR201815757T4; US20130255142A1; EP2613137A1; EP3124575A1

Abstract

An object is to provide a method for more precisely estimating the thermal plasticity of coal and a caking additive with a simple method by observing the thermal plasticity of coal and a caking additive under the condition that sufficiently simulates an environment surrounding thermal plastic coal and a caking additive in a coke oven and to provide a method for preparing coal of a brand having a specified quality by making clear the required quality of a coal brand which can be ideally used for manufacturing high-strength coke by using the estimation method. A method for preparing coal for coke making, the method including adjusting a permeation distance of one or more kinds of coal to a specified value or less when plural coal brands are blended as materials to be used for coke making is used. It is preferable that the specified value of a permeation distance be double the weighted mean value of those of the coal brands contained in a coal blend and that the permeation distance of coal be decreased by exposing the coal to an atmosphere containing oxygen.

Description

The preparation method of coal for coke production

Technical field

The present invention relates to the test method STRENGTH ON COKE manufacture coal softening melting characteristic when a kind of service precision evaluates the dry distillation of coal well carry out evaluating and the method preparing coal for coke production of coke strenth can be improved according to its result.

Background technology

The coke used in the blast furnace process the most generally carried out as iron-refining process carries the multiple effect such as reducing material, thermal source, distance piece of iron ore.In order to operate with making blast furnace stability and high efficiency, importantly to keep the aeration in blast furnace, therefore, require to manufacture the high coke of intensity.Coke manufactures by pulverizing and adjusting mixed coal destructive distillation in coke-fired furnace that the various coal for coke production after granularity coordinate.There is softening melting in coal for coke production, and the generation of simultaneous volatile ingredient and foam, expand in destructive distillation in the temperature range of about 300 DEG C ~ 550 DEG C, thus each particle is mutually bonding and become block semicoke.Semicoke shrinks being warming up to subsequently in the process near 1000 DEG C, thus bakes and become firm coke.Therefore, adhesion properties when coal softens melting can bring significant impact to proterties such as the coke strenth after destructive distillation and particle diameters.

As mentioned above, the softening melting characteristic of coal to a great extent left and right coke proterties after destructive distillation and charge of coke structure, therefore of crucial importance, always trying to explore its assay method always.Particularly, the coke strenth as the important quality of coke is subject to coal proterties, the particularly degree of coalification of its raw material and the impact of softening melting characteristic to a great extent.There is the character of softening melting when softening melting characteristic refers to and adds hot coal, usually, measure by the mobility, viscosity, cementability, swelling property etc. of softening fused mass, evaluate.

In the softening melting characteristic of coal, as the conventional method of the mobility measured when softening melting, can enumerate: the coal fluidity test method that the employing Dieter Gieseler plastometer method that JIS M8801 specifies is carried out.Dieter Gieseler plastometer method is as follows: put in the crucible of regulation by the coal being crushed to less than 425 μm, heat with the programming rate of regulation, the rotating speed being applied with the stirring rod of regulation torque is read by index dial, represent with ddpm (rotational speed index dial, dial division per minute).

Dieter Gieseler plastometer method is the rotating speed of the stirring rod measuring constant torque, on the other hand, also devises the method measuring torque by determining rotating speed mode.Such as, in patent documentation 1, describe the method in the Simultaneously test torque making rotor rotate with constant rotating speed.

In addition, exist by the viscosity measurement (for example, referring to patent documentation 2) utilizing Measurement of Dynamic Viscoelasticity device to carry out measured for the purpose of the viscosity softening melting characteristic to physical significance.The mensuration of the viscoelasticity behavior that Measurement of Dynamic Viscoelasticity shows when referring to and periodically apply power to viscoelastic body.The feature of the method described in patent documentation 2 is, be have rated the viscosity of softening melting coal by the multiple coefficient of viscosity measured in the parameter that obtains, and the viscosity of softening melting coal under can measuring any shear rate.

In addition, there was reported the softening melting characteristic as coal, utilize activated charcoal or beaded glass to determine the example their coal being softened to fused mass cementability.Method is as follows: heated from the state that above-below direction clamps by activated charcoal, beaded glass by a small amount of coal test portion, cools after softening melting, observes the cementability between coal and activated charcoal, beaded glass from outward appearance.

As the expansile conventional method measured when coal softens melting, the dilatometric method specified in JIS M8801 can be enumerated.Dilatometric method is as follows: by shaping according to the method for regulation for the coal being crushed to less than 250 μm, put into the crucible of regulation, heat with the programming rate specified, measured the rheological parameters' change with time of the displacement of coal by the test rod being configured at coal top.

In addition, also the known coal swelling property test method through behavior improving the gas produced when coal softens melting softens melting behavior (for example, referring to patent documentation 3) for the coal in simulation coke-fired furnace.The method is as follows: the bottom between coal seam and piston or between coal seam and piston and coal seam configuration permeability material, increase the volatile ingredient that produced by coal and fluent meterial through path, thus make mensuration environment closer to the expansion behavior in coke-fired furnace.Similarly, also known configuration on coal seam has the material running through path, and imposed load is while carry out microwave heating to measure the expansile method (with reference to patent documentation 4) of coal to coal.

Prior art document

Patent documentation

Patent documentation 1: Japanese Unexamined Patent Publication 6-347392 publication

Patent documentation 2: Japanese Unexamined Patent Publication 2000-304674 publication

Patent documentation 3: Jap.P. No. 2855728 publication

Patent documentation 4: Japanese Unexamined Patent Publication 2009-204609 publication

Non-patent literature

The work such as non-patent literature 1: Zhu Fu: " fuel association will (combustion material Association meeting Chi) ", Vol.53,1974, p.779-790

The work such as non-patent literature 2: Gong Jin: " NKK skill report (Japanese Steel pipe skill Reported) ", vol.67,1975 years, p.125-137

Summary of the invention

The problem that invention will solve

In the manufacture of metallurgical coke, general use is combined with the coal of multiple kind and the mixed coal that obtains with given ratio, if but correctly cannot evaluate its softening melting characteristic, then can there is the problem that cannot meet required coke strenth.When employing the low-intensity coke not meeting given intensity in the vertical heaters such as blast furnace, the generation of the powder in vertical heater can be increased and cause the increase of the pressure loss, thus likely make the fluctuation of service of vertical heater, and cause the flowing of gas concentrate on local so-called channeling (Chui き order け) trouble.

Softening melting characteristic index in the past cannot the situation of predicted intensity exactly quite a few.Thus, rule of thumb come from the inequality of the coke strenth of the inaccuracy of the evaluation of softening melting characteristic by consideration and the coke strenth as target is preset higher, coke strenth is controlled as more than certain value.But in the method, owing to needing to use, generally known softening melting characteristic is excellent but the average grade of mixed coal sets higher by price is higher coal, therefore can cause the increase of cost.

In coke-fired furnace, coal during softening melting is softening melting under the state retrained by adjacent layer.Because the temperature conductivity of coal is little, therefore in coke-fired furnace, coal fails thermally equivalent, state difference from the side, furnace wall as hot face, is followed successively by coke layer, softening melting layer, coal seam.How many coke-fired furnaces originally can expand when destructive distillation, but substantially can not be out of shape, and therefore, the coal of softening melting is retrained by adjacent coke layer, coal seam.

In addition, around the coal of softening melting, there is a lot of defect structures such as the coal inter-particle voids in coal seam, the inter-particle voids of softening melting coal, the thick pore produced due to thermal decomposition gaseous volatilization, the crackle that produces at adjacent coke layer.The width of the crackle particularly coke layer produced be hundreds of micron to a few millimeter, than the coal inter-particle voids of tens ~ hundreds of microns size and pore large.Therefore, be not only the thermal decomposition gas as the accessory substance produced by coal and fluent meterial, permeate in the gross defects that the coal itself softening melting also can produce to above-mentioned coke layer.In addition, can envision, when it permeates, the shear rate acting on the coal of softening melting is different because of the kind of coal.

Inventors etc. think, in order to precision more excellent control the intensity of coke, need the coal obtained measuring under the condition simulating the environment be placed in coke-fired furnace coal as above to soften melting characteristic and use as index.Wherein, carry out measuring under the condition simulating the movement of the peripherad defect sturcture of fused mass, infiltration and be considered to important under the bound condition of the coal after softening melting.But, in assay method in the past, there is problem below.

Dieter Gieseler plastometer method carries out measuring being filled into by coal under the state in container, therefore exist do not consider to retrain completely, the problem of infiltration condition.In addition, the method is not suitable for the mensuration of the coal with display high fluidity.Its reason is, when measuring the coal with display high fluidity, following situation may be there is: inside generation container, wall portion becomes the phenomenon (Weissenberg effect) of cavity, stirring rod dallies, mobility (for example, referring to non-patent literature 1) cannot be evaluated exactly.

Utilize and determine the method that rotating speed mode measures torque and do not considering constraint condition, infiltration condition this point Shortcomings similarly.In addition, measure under constant shear rate, therefore as mentioned above can not the softening melting characteristic of comparative evaluation coal exactly.

Measurement of Dynamic Viscoelasticity device is by using the viscosity as softening melting characteristic as object, be can under any shear rate viscometric device.Therefore, as long as be set as shear rate when measuring to act on the value of coal in coke-fired furnace, the viscosity of softening melting coal in coke-fired furnace just can be measured.But, in general, to measure in advance or the shear rate of coal in coke-fired furnace of estimating each grade kind is difficult.

As the softening melting characteristic of coal, although utilize activated charcoal or beaded glass to measure reproduce infiltration condition relative to the method for their cementability under existing in coal seam, there is the problem not simulating coke layer and gross defects.In addition, not mensuration this point also Shortcomings under the constraints.

Utilizing in the coal swelling property test method of permeability material described in patent documentation 3, consider produced by coal gas, fluent meterial movement, but exist and do not consider the problem of the movement of the coal of softening melting itself.This is because the permeability of the permeability material used in patent documentation 3 is not enough to make softening melting coal move.Find after the actual test carried out described in patent documentation 3 such as the present inventor, the infiltration of softening melting coal to permeability material does not occur.Therefore, in order to make softening melting coal penetrate in permeability material, need to consider new condition.

Patent documentation 4 also discloses similarly to configure on coal seam has the material running through path, and consider produced by coal gas, fluent meterial the swelling property assay method of coal of movement, but limiting except this problem except existing in heating means, also there is the indefinite problem of condition for evaluating the phenomenon of osmosis in coke-fired furnace.In addition, in patent documentation 4, the phenomenon of osmosis of coal fused mass and the relation of softening melting behavior indefinite, the relation of the quality of the not mentioned phenomenon of osmosis of coal fused mass and the coke of generation, does not record the manufacture of colory coke yet.

Like this, under the prior art, the softening melting characteristic such as pressure when expansivity, infiltration when can not measure the mobility of coal and binding material, viscosity, cementability, perviousness, infiltration under the state simulating in coke-fired furnace the softening coal of melting and the surrounding environment of binding material fully.

Therefore, the object of the invention is to, solve the problem of above-mentioned prior art, by the softening melting characteristic of the coal under the state that is determined at the surrounding environment of the coal of simulating softening melting in coke-fired furnace fully, a kind of softening melting characteristic evaluation method of coal is more accurately provided, use the method clearly to manufacture the quality of the preferred coal kind of the coal kind of high-strength coke, thus provide preparation to have the method for the coal of the kind of such quality.

The method of dealing with problems

Feature of the present invention for solving the problem is as follows.

[1] preparation method for coal for coke production, the method comprises: prepare as coke manufacture raw material independent coal or with other coal with the use of the coal of individual plants time, the seepage distance of the coal of described kind is adjusted to below set-point.

[2] preparation method for coal for coke production, the method comprises: when mixing multiple coal to manufacture coal for coke production, being adjusted to after below set-point by the seepage distance of at least one coal and mixing.

[3] preparation method of above-mentioned [1] or the coal for coke production described in [2], wherein, is adjusted to more than 100ddpm by most for the Dieter Gieseler of described coal kind high fluidity.

The preparation method of the coal for coke production [4] according to any one of above-mentioned [1] ~ [3], wherein, specifies the set-point of the seepage distance of the coal kind of described preparation by following formula (1),

Seepage distance=1.3 × a × logMFc (1)

Wherein, a be the seepage distance of at least one above coal of common logarithm value in the scope of logMF < 2.5 of the most high fluidity MF of Dieter Gieseler and logMF are measured and the regression straight line using this measured value to make by initial point time, the constant of 0.7 ~ 1.0 times of scope of logMF coefficient

MFc is the most high fluidity (ddpm) of Dieter Gieseler of the coal of preparation.

The preparation method of the coal for coke production [5] described in above-mentioned [4], wherein, described a be the common logarithm value logMF of the most high fluidity MF of the seepage distance of the above coal of at least one in 1.75 < logMF < 2.50 scopes and Dieter Gieseler is measured and the regression straight line using this measured value to make by initial point time, the constant of 0.7 ~ 1.0 times of scope of logMF coefficient.

The preparation method of the coal for coke production [6] according to any one of above-mentioned [1] ~ [3], wherein, specifies the set-point of the seepage distance of the coal kind of described preparation by following formula (2),

Seepage distance=a ' × logMFc+b (2)

Wherein, the seepage distance that a ' is at least one above coal of common logarithm value in logMF < 2.5 scope to the most high fluidity MF of Dieter Gieseler and logMF measure and the regression straight line using this measured value to make by initial point time, the constant of 0.7 ~ 1.0 times of scope of logMF coefficient

B is more than the mean value of standard deviation when repeatedly measuring the same test portion of more than one coals in the coal of the kind be selected from for making described regression straight line and is the constant of less than 5 times of described mean value,

The preparation method of the coal for coke production [7] described in above-mentioned [6], wherein, described a ' for the common logarithm value logMF of the most high fluidity MF of the seepage distance of the above coal of at least one in 1.75 < logMF < 2.50 scopes and Dieter Gieseler is measured and the regression straight line using this measured value to make by initial point time, the constant of 0.7 ~ 1.0 times of scope of logMF coefficient.

The preparation method of the coal for coke production [8] according to any one of above-mentioned [1] ~ [3], wherein, the set-point of seepage distance is 15mm, and it is the melting test portion measured value of seepage distance of permeating to described beaded glass in the following cases,

Described situation is: will be prepared into the coal of below particle diameter 2mm with 0.8g/cm ³packed density be filled in container, make its thickness be 10mm, make test portion, this test portion configures the beaded glass of diameter 2mm, apply the load of 50kPa on the top of this beaded glass, and with the firing rate of 3 DEG C/minute, described test portion is heated to 550 DEG C.

The preparation method of the coal for coke production [9] according to any one of above-mentioned [1] ~ [3], wherein, pre-determine the kind of the multiple coal forming mixed coal, the value of more than 2 of the mean value of the seepage distance of these coals times is set to the set-point of described seepage distance.

The preparation method of the coal for coke production [10] according to any one of above-mentioned [1] ~ [9], wherein, when preparing the coal of individual plants, adjusts seepage distance by multiple coal mixing different for the place of production.

The preparation method of the coal for coke production [11] according to any one of above-mentioned [1] ~ [9], wherein, to be placed in coal by the temperature more than normal temperature and to comprise O ₂, CO ₂, H ₂process in the atmosphere of more than one compositions in O, the seepage distance adjusting this coal makes it reduce.

The preparation method of the coal for coke production [12] described in above-mentioned [11], wherein, described process is carried out under treatment temperature 100 DEG C ~ 300 DEG C, 1 ~ 120 minute processing time.

The preparation method of the coal for coke production [13] described in above-mentioned [12], wherein, described process is carried out under treatment temperature 180 DEG C ~ 200 DEG C, 1 ~ 30 minute processing time.

The effect of invention

According to the present invention, by using the defect structure around the softening melting layer can simulating the coal be present in coke-fired furnace, being particularly present in the impact of the be full of cracks on the coke layer adjacent with softening melting layer, and the measured value of the evaluation of the softening melting characteristic of coal under the state having reproduced the constraint condition around the softening fused mass in coke-fired furnace rightly, namely softening fused mass is to the seepage distance of defect structure, the feed coal that the metallurgical coke can preparing applicable high strength manufactures.

Accompanying drawing explanation

[Fig. 1] illustrates that the material that the test portion that uses in the present invention and top and bottom have a through hole applies certain load to measure the skeleton diagram of an example of the device of softening melting characteristic.

[Fig. 2] illustrates that the top and bottom used in the present invention have the skeleton diagram of an example of the material in the material of through hole with manhole.

[Fig. 3] illustrates that the top and bottom used in the present invention have the skeleton diagram of an example of spheroidal particle packed layer in the material of through hole.

[Fig. 4] illustrates that the top and bottom used in the present invention have the skeleton diagram of an example of cylinder packed layer in the material of through hole.

[Fig. 5] illustrates that coal softens the figure of the measurement result of the seepage distance of fused mass.

[Fig. 6] be the seepage distance of A coal and the F coal illustrating that embodiment 1 uses and most high fluidity, figure with the position relationship of the scope of the seepage distance and most high fluidity that meet (a).

[Fig. 7] be the seepage distance of A coal and the F coal illustrating that embodiment 1 uses and most high fluidity, figure with the position relationship of the scope of the seepage distance and most high fluidity that meet (b).

[Fig. 8] illustrates that the material coal test portion used in the present invention and top and bottom with through hole remains a constant volume to measure the skeleton diagram of an example of the device of softening melting characteristic.

Symbol description

1 test portion

2 top and bottom have the material of through hole

3 containers

5 sleeves

7 thermometers

8 heaters

9 temperature detectors

10 temperature regulators

11 gas introduction ports

12 gas discharge outlets

13 expansivity test rods

14 counterweights

15 displacement instrument

16 manholes

17 particle filled composites

18 fill cylinder

Embodiment

Coke is normally to the coal being combined with the multi items with various grade and the mixed coal obtained carries out destructive distillation manufactures.For the grade of the coal of each kind, normally producing coal adjust grade after shipment, to meet the grade of the benchmark of regulation in purchase contract etc.Its grade is by the restriction of the grade of the coal of institute's output, even same colliery, its grade also can be different because of the disposal route after output place and output.

The discoveries such as the present inventor, can be measured by new assay method, be evaluation index more excellent than existing index in control coke strenth as " seepage distance " of the New Appraisement index of softening melting characteristic.And, be studied having the preparation method being judged as preferably softening the feed coal kind of melting characteristic by new evaluation method, found that, by combining the coal of various trait or carrying out suitable anticipating to coal, the coal of anticipant character can be prepared, thus complete the present invention.The mensuration of " seepage distance " can be carried out substantially as follows.

Fig. 1 illustrates an example of the determinator of the softening melting characteristic (seepage distance) used in the present invention.Fig. 1 is the device of the material having a through hole to coal test portion and top and bottom when applying certain load and heat coal test portion.At the under-filled coal of container 3, as test portion 1, test portion 1 configures the material 2 that top and bottom have through hole.Test portion 1 is heated to softening melting and starts more than temperature, make test portion penetrate into top and bottom and have in the material 2 of through hole, and measure seepage distance.Heating is carried out under non-active gas atmosphere.Here, non-active gas refers to the gas do not reacted with coal in mensuration temperature range, and representatively property gas is argon gas, helium, nitrogen etc.And the mensuration of seepage distance also can heating while coal is remained a constant volume with the material with through hole.Fig. 8 is illustrated in by one of the determinator of the softening melting characteristic (seepage distance) used in this situation.

When the material 2 having a through hole to test portion 1 and top and bottom shown in Fig. 1 applies certain load and heats test portion 1, test portion 1 demonstrates and expands or shrink, and the material 2 that top and bottom have through hole moves at above-below direction.Therefore, the material 2 of through hole can be had to measure expansivity during test portion infiltration by top and bottom.As shown in Figure 1, on the material 2 that top and bottom have through hole, configure expansivity test rod 13, at the upper ends load applying counterweight 14 of expansivity test rod 13, configure displacement instrument 15 thereon, measure expansivity.As long as displacement instrument 15 uses the displacement instrument that can measure the range of expansion (-100% ~ 300%) of the expansivity of test portion.Because needs will remain non-active gas atmosphere in heating systems, therefore contactless displacement instrument is comparatively suitable, preferably uses optical displacement instrument.As non-active gas atmosphere, be preferably set to nitrogen atmosphere.When the material 2 that top and bottom have a through hole is for particle-filled layer, because expansivity test rod 13 may be buried underground not in particle-filled layer, therefore preferably take the measure in top and bottom with clamping plate between the material 2 of through hole and expansivity test rod 13.The load applied preferably is applied to the top and bottom be configured at above test portion equably and has above the material of through hole, area above material top and bottom to through hole, applied pressure is 5 ~ 80kPa, is preferably 15 ~ 55kPa, most preferably is 25 ~ 50kPa.This pressure preferably sets according to the swelling pressure of the softening melting layer in coke-fired furnace, but, found that of detect force of the research repeatability of measurement result, the grade kind difference of various coal, especially most preferably using about the 25 ~ 50kPa slightly higher than the swelling pressure in stove as condition determination.

Heating arrangement preferably uses to measure test portion temperature and can carry out the device of the mode work of heating with the programming rate of regulation.Specifically, be electric furnace and combination electric conductivity container and the external-heat of high-frequency induction or the such internal heating of microwave.When adopting internal heating, need to take measures to make homogeneous temperature in test portion, such as, preferably take the measure of the thermal insulation improving container.

About firing rate, from the coal in simulation coke-fired furnace and softening melting behavior this purpose of binding material, need to make the firing rate of the coal in coke-fired furnace consistent.The firing rate of the coal within the scope of the softening melt temperature in coke-fired furnace is different because of position in stove and operating condition, but is roughly 2 ~ 10 DEG C/minute, as average heating rate, is preferably 2 ~ 4 DEG C/minute, is particularly preferably about 3 DEG C/minute.But, when the coal that mobility as non-micro-binding coal is low, may seepage distance and expand little under the condition of 3 DEG C/minute, detection difficult.It is generally acknowledged that coal is by Fast Heating, the mobility adopting Dieter Gieseler plastometer to record improves.Therefore, when such as seepage distance is the coal of below 1mm, in order to improve detection sensitivity, also firing rate can be increased to 10 ~ 1000 DEG C/minute and measure.

About the temperature range of carrying out heating, be intended to the softening melting characteristic evaluating coal and binding material, therefore, as long as the softening melt temperature scope of coal and binding material can be heated to.If consider the softening melt temperature scope of coal for coke production and binding material, as long as then in the scope of 0 DEG C of (room temperature) ~ 550 DEG C, preferably carry out heating with the firing rate of regulation in the scope of 300 ~ 550 DEG C of the softening melt temperature as coal.

The material that top and bottom have a through hole preferably can measure or calculate the material of its transmission coefficient in advance.As the example of material shape, the one-piece type material with through hole, particle-filled layer can be enumerated.As the one-piece type material with through hole, can enumerate such as: the material with the manhole 16 shown in Fig. 2, the material with rectangular through-hole, there is the material etc. of erose through hole.As particle-filled layer, substantially be divided into spheroidal particle packed layer, nonspherical particle packed layer, as spheroidal particle packed layer, can enumerate: the packed layer be made up of the particle filled composite 17 of the pearl described in Fig. 3, as nonspherical particle packed layer, can enumerate: the packed layer etc. be made up of the filling cylinder 18 shown in unsetting particle or Fig. 4.In order to keep the repeatability measured, the transmission coefficient in material as far as possible evenly, and in order to make mensuration easy, preferably easily calculates the material of transmission coefficient.Therefore, the material that the top and bottom that the present invention uses have through hole particularly preferably uses spheroidal particle packed layer.As long as the material that top and bottom have the material of through hole softens more than melt temperature scope at coal, specifically below 600 DEG C, shape does not change substantially, and with the material that coal does not react, be not particularly limited.In addition, as long as the enough height required for fused mass infiltration of its height coal, when heating thickness is the coal seam of 5 ~ 20mm, about 20 ~ 100mm.

The transmission coefficient that top and bottom have the material of through hole needs the transmission coefficient estimating the gross defects that coke layer exists to set.About particularly preferably transmission coefficient of the present invention, the present inventor etc. are by investigating found that of the further investigations such as the supposition of gross defects constituent element and size, and transmission coefficient is 1 × 10 ⁸~ 2 × 10 ⁹m ^-2situation best.This transmission coefficient is that the Darcy rule represented by following formula (3) derives.

ΔP/L＝K·μ·u···(3)

Wherein, Δ P is the pressure loss [Pa] that top and bottom have in the material of through hole, and L is the height [m] of the material with through hole, and K is transmission coefficient [m ^-2], the speed [m/s] of μ to be fluid viscosity [Pas], u be fluid.Such as, when using the glass bead layer of uniform grading to have the material of through hole as top and bottom, in order to make it have above-mentioned suitable transmission coefficient, the beaded glass of diameter about 0.2mm ~ 3.5mm is preferably selected, the particularly preferably beaded glass of diameter 2mm.

Pulverize in advance as the coal and binding material that measure test portion, fill given thickness with given packed density.As grinding particle size, it can be the granularity (particle diameter is the ratio of the particle of below 3mm is overall about 70 ~ 80 quality %) of the loading coal in coke-fired furnace, preferably make particle diameter be below 3mm reach more than 70 quality %, but, consider it is the mensuration of carrying out in dingus, particularly preferably use crushed material total weight being crushed to below particle diameter 2mm.The density that powder filler minces can be consistent with the packed density in coke-fired furnace, is set to 0.7 ~ 0.9g/cm ³but the result of research repeatability, detect force, has drawn preferred 0.8g/cm ³conclusion.In addition, the thickness of filling can be set to thickness 5 ~ 20mm according to the thickness of the softening melting layer in coke-fired furnace, but the result of research repeatability, mensuration power, draw the conclusion of the preferred 10mm of thickness.

In the mensuration of above seepage distance, by as follows for representational condition determination record.

(1) coal or binding material are pulverized and reach 100 quality % for below particle diameter 2mm, by the coal after this pulverizing or binding material with packed density 0.8g/cm ³be filled in container, and make thickness reach 10mm, make test portion,

(2) on this test portion, the beaded glass of diameter 2mm is configured with thickness (usually, thickness 80mm) more than seepage distance,

(3) from the top imposed load of described beaded glass, and make pressure reach 50kP, and in non-active gas atmosphere, be heated to 550 DEG C from room temperature with the firing rate of 3 DEG C/minute,

(4) seepage distance that melting test portion permeates in described glass bead layer is measured.

Originally be preferably can add the seepage distance hankering the softening fused mass often measuring coal and binding material continuously.But often the impact etc. measured owing to being subject to the tar that test portion produces is difficult.It is irreversible for heating the expansion of coal, the phenomenon of osmosis that cause, once expand, after infiltration, even if cooling also keeps its shape substantially, therefore, after the infiltration of coal fused mass terminates, cooling whole container, can hankering where penetrating into by measuring cooled seepage distance to measure to add.Such as, the material that top and bottom have through hole can be taken out from cooled container, directly measure with vernier caliper or scale.In addition, when using particle to have the material of through hole as top and bottom, the softening fused mass penetrated in inter-particle voids makes until the overall cementation of the particle layer of permeate portion.Therefore, by obtaining the quality of particle-filled layer and the relation of height in advance, after infiltration terminates, measuring the quality of the particle of non-cementation, deducting from initial mass, the quality of the particle of cementation can be derived, can seepage distance be calculated thus.

The superiority of such seepage distance is not only and is guessed in theory close to the assay method of situation in coke-fired furnace according to adopting, and is confirmed by the result of the impact of investigation seepage distance matter on Coke Strength.In fact, even confirmed the coal with identical logMF (the common logarithm value based on the most high fluidity of Dieter Gieseler plastometer method) by evaluation method of the present invention, because the different seepage distance of kind still exists difference, the impact confirming coke strenth when manufacturing coke to the coal coordinating seepage distance different is also different.

In the past utilize in the evaluation of softening melting characteristic of Dieter Gieseler plastometer, for display mobility coal for, can think that the effect that coal particle is bonded to each other by it is also high.On the other hand, the relation of seepage distance and coke strenth is known by inquiry, when the great coal of cooperation seepage distance, thick defect can be remained when coked, and form the institutional framework of thin air vent wall, therefore, coke strenth reduction compared with the value envisioned according to the average grade of mixed coal.This can infer it is because permeate significantly between the peripherad coal particle of coal that seepage distance is excessive, thus the part itself that this coal particle is existed originally becomes large hole, thus defines defect.Particularly demonstrate in the coal of high fluidity in the evaluation of softening melting characteristic utilizing Dieter Gieseler plastometer, the growing amount of known thick defect remaining in coke is different according to the size of seepage distance.For binding material, also can similarly see this relation.

The present inventor etc. conduct in-depth research repeatedly, found that, for the scope of the seepage distance of the coal that coke strenth can be caused to reduce when being coupled to and using in coke production of raw material for use and binding material, specify it is effective with following (a) ~ (d) these 4 kinds.

A () carrys out the scope of regulation seepage distance by following formula.

Seepage distance=1.3 × a × logMFc

Wherein, a be at least one of the coal and binding material that are in logMF < 2.5 scope more than seepage distance and logMF when measuring and use this measured value to make regression straight line by initial point, the constant of 0.7 ~ 1.0 times of scope of logMF coefficient.MFc is the most high fluidity (ddpm) of Dieter Gieseler of the coal of scope for judging seepage distance.

B () carrys out the scope of regulation seepage distance by following formula.

Seepage distance > a ' × logMFc+b

Wherein, a ' for the seepage distance more than at least one of the coal be in logMF < 2.5 scope and binding material and logMF are measured and the regression straight line using this measured value to make by initial point time, the constant of 0.7 ~ 1.0 times of scope of logMF coefficient.B is more than the mean value of standard deviation when repeatedly measuring the same test portion of more than one coals in the coal of the kind be selected from for making described regression straight line and is the constant of less than 5 times of described mean value.MFc is the most high fluidity (ddpm) of Dieter Gieseler of the coal of scope for judging seepage distance.

C when () can pre-determine the mixed coal kind manufactured for coke, exceed 2 times of the simple mean value of the seepage distance of coal contained in mixed coal.

(d) by be prepared into below particle diameter 2mm, 100 quality % the coal test portion of granularity with 0.8g/cm ³packed density be filled in container, make its thickness be 10mm, use the beaded glass of diameter 2mm as the material with through hole, load the load of 50kPa, when being heated to 550 DEG C with the firing rate of 3 DEG C/minute and carrying out measuring, seepage distance is more than 15mm.

Here, the defining method providing these 4 kinds of management values of above-mentioned (a) ~ (d) be because: the value of seepage distance according to set condition determination, such as load, programming rate, there is the kind of the material of through hole, the formation of device etc. and change, therefore, consider that the situation of the condition determination different from example of the present invention is studied, found that (a) ~ defining method of (c) such management value is effective.

In addition, determine (a), (b) scope time the formula that uses in constant a and a ' determine as follows: measure the seepage distance that is in more than at least a kind coal of logMF < 2.5 scope and most high fluidity, and use the making of this measured value by the regression straight line of initial point, be defined as the scope of 0.7 to 1.0 times of the coefficient of logMF now.This is because, in the scope of logMF < 2.5, most roughly can see positive correlativity between high fluidity and seepage distance at coal, but the kind causing intensity to reduce is the kind that its seepage distance significantly departs from along forward relative to this correlativity.The present inventor etc. conduct in-depth research repeatedly, found that: be equivalent to utilize above-mentioned regression equation and the kind of the scope of more than 1.3 times of the seepage distance obtained according to the logMF value of coal is the kind causing intensity to reduce, thus carried out the regulation of scope like that such as formula (a).In addition, in order to detect relative to above-mentioned regression equation exceed error at measurment along forward bias from kind, find to meet in above-mentioned regression equation, to add that the kind measuring the scope of more than the value of 1 ~ 5 times of the standard deviation repeatedly to same test portion is the kind causing intensity to reduce, thus carried out the regulation of scope like that such as formula (b).So, as long as constant b uses the value of 1 ~ 5 times same test portion being measured to the standard deviation repeatedly, when condition determination in the present invention, be about 0.6 ~ 3.0mm.Now, any one formula is all determine the scope of the seepage distance causing intensity to reduce based on the logMF value of this coal.This is because MF is larger, in general seepage distance is higher, very important relative to departing from great degree its correlativity.And, in the making of regression straight line, also can use the known method utilizing the straight-line regression of least square method.The kind number of the coal used during recurrence is more, then the error returned is fewer, therefore preferably.Particularly, if the kind that MF is little, then seepage distance is little and error easily becomes large, therefore particularly preferably uses more than a kind of being in the coal of 1.75 < logMF < 2.50 scopes to obtain regression straight line.

Here, with constant a and a ', b come together specialized range be because, by reducing their value, can more reliably detect the coal causing intensity to reduce, its value can adjust according to operational requirement.But, if too reduce this value, even if presumption matter on Coke Strength then can be produced to be produced dysgenic coal and become too much and be actually the coal that intensity can not be caused to reduce and also think the problem that intensity can be caused to reduce by mistake, therefore a and a ' is preferably set to 0.7 ~ 1.0 times of the slope of regression straight line, in addition, b is preferably set to 1 ~ 5 times of standard deviation when same test portion is measured repeatedly.

If the coal will with the seepage distance value meeting scope shown in above-mentioned (a) ~ (d) uses according to common operation as the feed coal (raw coal) of coke, then can remain thick defect when coked, and form the institutional framework of thin air vent wall, therefore can cause the reduction of coke strenth.Therefore, be prepared into as far as possible and make the seepage distance of each coal kind less than above-mentioned management value, and use such coal as keeping the method for coke strenth to be easy and effective as much as possible.

Have the method for the feed coal of the single variety of desired characteristic as above as preparation, the coal mixing seepage distance different is the easiest.The present inventor etc. are studied seepage distance when being mixed with the coal of different quality, found that, the seepage distance measured value of the various coal mixture ratio of various coal is weighted average and value, basically identical with the seepage distance measured value of mixed coal that is that obtain, thus establishes the method for the seepage distance of adjustment feed coal.But, the fluctuation of weighted mean value and measured value inevitably existence value, therefore, preferably carry out the practical measurement of the seepage distance of mixed coal, and finally with the seepage distance of this value as this mixed coal, if when the seepage distance of practical measurement departs from the scope of the invention, can be controlled seepage distance by the little kind of additional cooperation seepage distance or the fit rate if possible reducing the large kind of seepage distance.

In addition, the seepage distance of coal by being carried out in atmosphere by coal heating or placing for a long time at normal temperatures making it reduce, thus can adjust.The process that this process is the oxidation or weathering that are called coal, is changed the degree of oxidation, the seepage distance of feed coal can be made to reduce by oxidizing conditions such as control temperature, time, oxygen contents.In the past, the oxidation of coal is considered to not preferred as causing the phenomenon of close-burning reduction, if but the new physical property using seepage distance such, then can judge preferred degree of oxidation, and having found the grade that can be improved coal by controlled oxidization degree, this point is key character of the present invention.Also find in addition, even there is not the atmosphere of oxygen, also can reduce seepage distance by the heating of more than 250 DEG C.

Usually known, the weathering of coal carry out speed dependent in oxygen concentration, pressure (air pressure), temperature, coal particle diameter, moisture content of coal etc.When making coal weathering in the value in order to control seepage distance and most high fluidity, as long as suitably control above-mentioned weathering essential factor.

The present inventor etc. make the experiment of coal weathering find by carrying out changing above-mentioned weathering essential factor, the difference because of weathering condition that underspeeds of seepage distance and most high fluidity.Below, carry out describing to its concrete grammar.

As atmosphere when carrying out weathering, need for oxidizing atmosphere.Oxidizing atmosphere mentioned here, refers to containing aerobic or containing can by oxygen dissociation, the atmosphere with the material of oxidability.Although there is countless such condition, if but the easy degree considered acquisition, control, preferably containing O ₂, CO ₂, H ₂the gas atmosphere of O.If gas atmosphere, then can utilize the concentration of oxidizing gas, pressure easily adjusts oxidizing force, in addition, by being replaced into non-active gas after treatment, promptly can prevent the carrying out of the oxidation of coal and binding material, therefore, the processing time also can at random set.Here, the concentration of oxidizing gas is higher, pressure is higher, then weathering is carried out faster.On the other hand, when the liquid atmosphere of oxidisability, be difficult to be separated rapidly with coal and binding material after weathering process, in the progress extent controlling weathering, not preferably.

In addition, oxidizing atmosphere that is the most cheap, that can easily and in a large number obtain is the air in air.Therefore, under industrially requiring the situations such as a large amount of process, the air preferably in use air is as oxidizing atmosphere.

As treatment temperature when carrying out weathering, can cause the weathering phenomenon of coal, implement under the arbitrary temp of the temperature range that just demonstrated softening melting from normal temperature to coal.Because the carrying out of the higher weathering of temperature is faster, therefore, treatment temperature is higher, and the required processing time is shorter.The present inventor etc. have studied the impact that treatment temperature causes weathered coal proterties, found that: treatment temperature is higher, and relative to the underspeeding of most high fluidity of weathered coal, underspeeding of seepage distance accelerates.That is, at high temperature weathering, then more preferentially can reduce seepage distance, and do not reduce the most high fluidity of weathered coal as far as possible.Therefore obtain following opinion: as the condition in preferred treatment temperature, processing time, high temperature, short time are effective.

On the other hand, if make coal weathering rapidly, then may produce nature along with oxidation heat liberation on fire, therefore need the countermeasure taking watering etc. to prevent nature on fire.In addition, if treatment temperature is too high, then the speed due to weathering is fast, is difficult to the proterties after controlling weathering process.In addition, coal can start to release volatile ingredient because of thermal decomposition from more than about 300 DEG C, and therefore softening melting characteristic changes.In addition, exist under the weathering process in the temperature range of releasing volatile ingredient makes the heating condition of flammable gas in oxidizing atmosphere, with the danger of blast.

Based on above-mentioned reason, be preferably 100 DEG C ~ 300 DEG C as treatment temperature when carrying out weathering, be preferably 1 ~ 120 minute as the processing time.Most preferably, being 180 DEG C ~ 220 DEG C as treatment temperature when carrying out weathering, is 1 ~ 30 minute as the processing time.

It should be noted that, the feed coal of the individual plants in the present invention is defined as: at arrival to moment of coke manufacturing works as the unit of the feed coal of single bulk management.Comprise as single bulk management: utilize the sampling from this batch and the representative assay value that obtains using characterize the situation of this whole batch proterties, the situation of storing at coal yard as single batch, the situation loading same coal groove, in purchase contract as the situation etc. of single batch or name of an article transaction.Therefore, the preparation of the feed coal in the present invention mixes not included in carrying out after arrival to coke manufacturing works the situation waiting process, but the stage before arrival to coke manufacturing works processes, this potpourri is defined as the feed coal of single variety.

As mentioned above, the present invention specify that the scope of the preferred coal quality as coke production of raw material for use by the test method(s) of new softening melting characteristic, makes this coal of preparation become possibility.If use the raw material prepared by method of the present invention, then can manufacture the coke of high-quality.

Embodiment

[embodiment 1]

The mensuration of seepage distance has been carried out to 18 kinds of coals and a kind of binding material.The coal used or the proterties of binding material as shown in table 1.Wherein, Ro is the average maximum reflectivity of vitrinite of the coal of JIS M8816, logMF is the common logarithm value of the most high fluidity utilizing Dieter Gieseler plastometer method to measure, and volatile ingredient (VM), ash content (Ash) are the measured values obtained based on the technical analysis method of JIS M8812.

[table 1]

The device shown in Fig. 1 is used to carry out the mensuration of seepage distance.Because type of heating is high-frequency induction heating formula, therefore the heater 8 of Fig. 1 is load coil, and the materials'use of container 3 is as dielectric graphite.The diameter of container is 18mm, is highly 37mm, has the material of through hole as top and bottom, employ the beaded glass of diameter 2mm.To be crushed to the coal test portion 2.04g after below granularity 2mm at room temperature vacuum drying loads in container 3, the counterweight of heavy 200g is fallen 5 times by the distance that falls with 20mm above coal test portion and is filled with test portion 1 (in this condition, test portion thickness is for 10mm).Then, the beaded glass of diameter 2mm is configured on the packed layer of test portion 1, makes it reach the thickness of 25mm.Beaded glass packed layer configures the sillimanite rounding dish of diameter 17mm, thick 5mm, places the quartz system rod as expansivity test rod 13 thereon, then place the counterweight 14 of 1.3kg on the top of quartz pushrod.Thus, the pressure be applied on sillimanite disk is just 50kPa.As non-active gas, employ nitrogen, be heated to 550 DEG C with the firing rate of 3 DEG C/minute.After heating terminates, cool in nitrogen atmosphere, from cooled container, measure not with softening melting after the pearl quality of coal cementation.It should be noted that, above-mentioned condition determination is determined as the condition determination of preferred seepage distance by inventor etc. according to the comparison of the measurement result under various condition, but seepage distance mensuration is not limited to the method.

It should be noted that, as long as the thickness of the glass bead layer configured reaches the thickness of more than seepage distance.Fused mass penetrating into glass bead layer topmost when measuring, increasing the amount of beaded glass and again measuring.Inventors etc. have carried out the test changing the thickness of beaded glass, and confirm if beaded glass thickness more than seepage distance, then the seepage distance measured value of same test portion is identical.When carrying out the mensuration of the large binding material of seepage distance, use larger container and the loading increasing beaded glass measures.

Seepage distance is set to the packed height of the bead layer that there occurs cementation.Obtain the packed height of beaded glass packed layer and the relation of quality in advance, thus beaded glass packed height can be derived according to the quality of the pearl of the coal institute cementation after softening melting.Its result is formula (8), is derived seepage distance by formula (8).

L＝(G－M)×H…(8)

Wherein, L represents seepage distance [mm], and G represents filled beaded glass quality [g], and M represents the pearl quality [g] do not had with softening fused mass cementation, and H represents the packed layer height [mm/g] of the every 1g beaded glass be filled in this experimental provision.

Relation between seepage distance measurement result and the logarithm value (logMF) of the most high fluidity (Maximum Fluidity:MF) of Dieter Gieseler is shown in Fig. 5.According to Fig. 5, can see that the seepage distance measured in the present embodiment is relevant to most high fluidity, even and identical MF also can exist difference in the value of seepage distance.Such as, the error at measurment of the seepage distance utilizing this device is studied, consequently, for the result of carrying out 3 tests under identical conditions, standard deviation is 0.6, if consider this situation, then for the substantially equal coal A of most high fluidity and coal C, obvious difference can be seen in seepage distance.

Then, in order to investigate the relation of the Coal and coke intensity meeting above-mentioned (a) ~ (d), make and be combined with the mixed coal not meeting the coal A of (a) ~ (d) of 20 quality %, be combined with the mixed coal meeting the coal F of (a) ~ (d) of 20 quality %, and the coke strenth after its destructive distillation is measured.Coordinate composition as shown in table 2.

[table 2]

Wherein, the simple mean value for the seepage distance of coal coordinated is the seepage distance of 7.4mm, F coal is 19.5mm, is more than 2 times of mean value, meets the situation of (c).In addition, because seepage distance is more than 15mm, thus, F coal also meets (d).

In addition, in A ~ R coal, based on the value of the seepage distance of the coal in logMF < 2.5 scope and most high fluidity, calculate the slope of regression straight line, constant a and a ' of formula (1), formula (2) is defined as consistent with this slope 2.82.The constant b of formula (2) is defined as 3.0 by 5 times of value of the standard deviation 0.6 under the condition determination of example of the present invention.Based on these formulas, the result that the position relationship of the scope of the seepage distance of the binding material used the present embodiment and most high fluidity and above-mentioned (a), (b) is studied is shown in Fig. 6, Fig. 7.According to Fig. 6, Fig. 7, F coal also meets any condition of (a), (b) scope.On the other hand, A coal does not meet (a) ~ (d).

In coordinating in theory for the coal estimating coke strenth in the past, think that coke strenth determines (for example, referring to non-patent literature 2) primarily of the logarithm value (logMF) of the most high fluidity of the average maximum reflectivity of vitrinite (Ro) of coal and Dieter Gieseler.Therefore, made the mixed coal (Ro=0.98, logMF=2.3) being combined with various coal, made the weighted mean Ro of mixed coal entirety, weighted mean logMF equal.At this, the size reduction of coal, to being less than particle diameter 3mm, 100 quality %, uses these coals to make mixed coal (the mixed coal a, f) of two levels that table 2 is recorded.The moisture of mixed coal entirety is adjusted to 8 quality %.This mixed coal 16kg is filled in destructive distillation tank, makes bulk density be 750kg/m ³, the counterweight of load 10kg thereon, carries out destructive distillation in 6 hours in this condition, then takes out from stove, carry out nitrogen cooling, obtain coke in the electric furnace of furnace wall temperature 1050 DEG C.The coke strenth obtained calculates as follows: based on the spin intensity test method(s) of JIS K2151, measures the mass ratio of coke of 15rpm, more than particle diameter 15mm after 150 turns, using with rotate before mass ratio calculate as barrate strength DI150/15.

The measurement result of the barrate strength of the coke manufactured by mixed coal a, f is also shown in table 2 in the lump.Also carry out CSR (CO ₂intensity after thermal response, according to ISO18894 benchmark), the mensuration of micro strength (MSI+65).Confirm: compared with being combined with the mixed coal a of the coal A not meeting (a) ~ (d), the intensity being combined with the mixed coal f of the coal F meeting (a) ~ (d) is low.Therefore can confirm, the value of the seepage distance that the present invention measures is the factor affecting intensity, and is inexplainable factor in existing factor.

As mentioned above, due to the validity that the coal that can confirm to employ seepage distance is evaluated, therefore, method preparation to the feed coal of desired seepage distance is studied.Use the method same as described above seepage distance to 5 of certain colliery kinds of coal seams to measure, result be 10.3,12.3,15.9,21.2,26.8mm.Measure the seepage distance of their equal amount of mixture (feed coal S), result is 17.9mm, is the value close with the mean value 17.3mm calculated.Change the mixing ratio of the test portion obtained by each coal seam, mix (feed coal T) in the mode that weighted mean seepage distance is 13.8mm and determine seepage distance, result is 13.1mm, remains the value close with calculated value.The logMF of feed coal S is 4.4, and the logMF of feed coal T is 4.3, and it is suitable that feed coal S meets above-mentioned (a) ~ (d), and feed coal T does not then meet.Use feed coal S or feed coal T carrys out the A coal in the mixed coal a of substitution list 2, carry out same retort experiment, its result, coke strenth (DI150/15) when using feed coal S is 77.5, coke strenth when using feed coal T is 78.7, uses high 1.2 points (table 3) of situation coke strenth of feed coal T.In this example embodiment, when the feed coal using seepage distance little, the effect improving coke strenth is also larger.According to this result, such as, by mixing the coal that obtained by various coal seam, the feed coal controlled by seepage distance in desired value can be prepared, by suitably adjusting the seepage distance of feed coal, the effect of the coke strenth that can be improved.

[table 3]

Replace the feed coal of A coal	S	T
			Seepage distance (mm)	17.9	13.1
LogMF（log ddpm）	4.4	4.3
			DI150/15(－)	77.5	78.7
	Comparative example	Example

In addition, in air atmosphere, process 10 minutes to above-mentioned raw materials coal S in 150 DEG C, seepage distance is now reduced to 14.0mm (this feed coal is feed coal U).In addition, to be positioned in air 4 months at normal temperatures to above-mentioned raw materials coal S, now seepage distance is reduced to 14.1mm (this feed coal is feed coal V).Now, the logMF=4.0 of feed coal U, the logMF=4.1 of feed coal V, feed coal U, V do not meet the scope of above-mentioned (a) ~ (d).For feed coal U, V, the A coal in the mixed coal a of also substitution list 2 coordinates, and has carried out above-mentioned retort experiment, and now respective coke strenth is 78.4,78.2 (table 4).With oxidation processes do not carried out to S coal and for compared with the intensity 77.5 when destructive distillation, obtain the result that the intensity of the coal after oxidation processes is high, by the process making seepage distance be reduced to suitable degree, can coke strenth be improved.It should be noted that, after carrying out oxidation processes, the most high fluidity (MF) of usual Dieter Gieseler also can reduce, therefore, if over oxidation, although seepage distance decline compared with set-point, MF value also reduces, coke strenth may reduce, and should be noted that in this.This MF reduces and can make up by increasing the process such as the fit rate of other high MF coal, but causes cost increase sometimes.Adjust seepage distance by oxidation processes and there is such problem, therefore, preferably rest on the oxidation processes of appropriateness.Wherein, when the coal mixing different coal seams adjusts seepage distance, the problem that MF reduces can not be there is, therefore, the adjustment of seepage distance can be carried out according to the grade of mixed feed coal.

[table 4]

Replace the feed coal of A coal	S	U	V
				Seepage distance (mm)	17.9	14.0	14.1
LogMF（log ddpm）	4.4	4.0	4.1
				DI150/15(－)	77.5	78.4	78.2
	Comparative example	Example	Example

In addition, according to Fig. 5, in the region of logMF > more than 2, the relevant fluctuation of logMF and seepage distance becomes large.Employ in the cooperation theory of Ro and MF above-mentioned, owing to controlling the weighted mean logMF of mixed coal, therefore, when MF and seepage distance relevant good, as long as control logMF just roughly can determine seepage distance.But, in the region of logMF > 2, i.e. MF > 100ddpm, relevant bad due to both, therefore, even if controlled by logMF as set-point, seepage distance also can be different, thus, coke strenth also can change sometimes.Therefore known, what more effectively played a role by the preparation method of feed coal of the present invention is the situation of the feed coal using MF > 100ddpm.

Claims

1. a preparation method for coal for coke production, the method comprises:

Prepare as coke manufacture raw material be used alone or with other coal with the use of the coal of individual plants time, the seepage distance of the coal of described individual plants is adjusted to below set-point, the set-point of the seepage distance of the coal of the individual plants of described preparation is specified by following formula (1)

Seepage distance=1.3 × a × logMFc (1)

2. the preparation method of coal for coke production according to claim 1, wherein, is adjusted to more than 100ddpm by most for the Dieter Gieseler of the coal of described individual plants high fluidity.

3. the preparation method of coal for coke production according to claim 1, wherein, described a be the common logarithm value logMF of the most high fluidity MF of the seepage distance of the above coal of at least one in 1.75 < logMF < 2.50 scopes and Dieter Gieseler is measured and the regression straight line using this measured value to make by initial point time, the constant of 0.7 ~ 1.0 times of scope of logMF coefficient.

4. the preparation method of coal for coke production according to claim 2, wherein, described a be the common logarithm value logMF of the most high fluidity MF of the seepage distance of the above coal of at least one in 1.75 < logMF < 2.50 scopes and Dieter Gieseler is measured and the regression straight line using this measured value to make by initial point time, the constant of 0.7 ~ 1.0 times of scope of logMF coefficient.

5. a preparation method for coal for coke production, the method comprises:

When mixing multiple coal and manufacturing coal for coke production, the seepage distance of the coal of at least one individual plants is adjusted to after below set-point and mixes again,

The set-point of the seepage distance of the coal of described individual plants is specified by following formula (1),

Seepage distance=1.3 × a × logMFc (1)

6. the preparation method of coal for coke production according to claim 5, wherein, is adjusted to more than 100ddpm by most for the Dieter Gieseler of the coal of described individual plants high fluidity.

7. the preparation method of coal for coke production according to claim 5, wherein, described a be the common logarithm value logMF of the most high fluidity MF of the seepage distance of the above coal of at least one in 1.75 < logMF < 2.50 scopes and Dieter Gieseler is measured and the regression straight line using this measured value to make by initial point time, the constant of 0.7 ~ 1.0 times of scope of logMF coefficient.

8. the preparation method of coal for coke production according to claim 6, wherein, described a be the common logarithm value logMF of the most high fluidity MF of the seepage distance of the above coal of at least one in 1.75 < logMF < 2.50 scopes and Dieter Gieseler is measured and the regression straight line using this measured value to make by initial point time, the constant of 0.7 ~ 1.0 times of scope of logMF coefficient.

9. a preparation method for coal for coke production, the method comprises:

Prepare as coke manufacture raw material be used alone or with other coal with the use of the coal of individual plants time, the seepage distance of the coal of described individual plants is adjusted to below set-point,

Wherein, specify the set-point of the seepage distance of the coal of the individual plants of described preparation by following formula (2),

Seepage distance=a ' × logMFc+b (2)

10. the preparation method of coal for coke production according to claim 9, wherein, is adjusted to more than 100ddpm by most for the Dieter Gieseler of the coal of described individual plants high fluidity.

The preparation method of 11. coal for coke production according to claim 9, wherein, described a ' for the common logarithm value logMF of the most high fluidity MF of the seepage distance of the above coal of at least one in 1.75 < logMF < 2.50 scopes and Dieter Gieseler is measured and the regression straight line using this measured value to make by initial point time, the constant of 0.7 ~ 1.0 times of scope of logMF coefficient.

The preparation method of 12. coal for coke production according to claim 10, wherein, described a ' for the common logarithm value logMF of the most high fluidity MF of the seepage distance of the above coal of at least one in 1.75 < logMF < 2.50 scopes and Dieter Gieseler is measured and the regression straight line using this measured value to make by initial point time, the constant of 0.7 ~ 1.0 times of scope of logMF coefficient.

The preparation method of 13. 1 kinds of coal for coke production, the method comprises:

The set-point of the seepage distance of the coal of described individual plants is specified by following formula (2),

Seepage distance=a ' × logMFc+b (2)

The preparation method of 14. coal for coke production according to claim 13, wherein, is adjusted to more than 100ddpm by most for the Dieter Gieseler of the coal of described individual plants high fluidity.

The preparation method of 15. coal for coke production according to claim 13, wherein, described a ' for the common logarithm value logMF of the most high fluidity MF of the seepage distance of the above coal of at least one in 1.75 < logMF < 2.50 scopes and Dieter Gieseler is measured and the regression straight line using this measured value to make by initial point time, the constant of 0.7 ~ 1.0 times of scope of logMF coefficient.

The preparation method of 16. coal for coke production according to claim 14, wherein, described a ' for the common logarithm value logMF of the most high fluidity MF of the seepage distance of the above coal of at least one in 1.75 < logMF < 2.50 scopes and Dieter Gieseler is measured and the regression straight line using this measured value to make by initial point time, the constant of 0.7 ~ 1.0 times of scope of logMF coefficient.

The preparation method of 17. 1 kinds of coal for coke production, the method comprises:

Wherein, the set-point of seepage distance is 15mm, and it is the melting test portion measured value of seepage distance of permeating to beaded glass in the following cases,

The preparation method of 18. coal for coke production according to claim 17, wherein, is adjusted to more than 100ddpm by most for the Dieter Gieseler of the coal of described individual plants high fluidity.

The preparation method of 19. 1 kinds of coal for coke production, the method comprises:

The preparation method of 20. coal for coke production according to claim 19, wherein, is adjusted to more than 100ddpm by most for the Dieter Gieseler of the coal of described individual plants high fluidity.

The preparation method of 21. 1 kinds of coal for coke production, the method comprises:

Wherein, when mixing multiple coal and manufacturing coal for coke production, pre-determine the kind of the multiple coal forming mixed coal, the value of more than 2 of the mean value of the seepage distance of these coals times is set to the set-point of described seepage distance.

The preparation method of 22. coal for coke production according to claim 21, wherein, is adjusted to more than 100ddpm by most for the Dieter Gieseler of the coal of described individual plants high fluidity.

The preparation method of 23. 1 kinds of coal for coke production, the method comprises:

Wherein, pre-determine the kind of the multiple coal forming mixed coal, the value of more than 2 of the mean value of the seepage distance of these coals times is set to the set-point of described seepage distance.

The preparation method of 24. coal for coke production according to claim 23, wherein, is adjusted to more than 100ddpm by most for the Dieter Gieseler of the coal of described individual plants high fluidity.

The preparation method of 25. coal for coke production according to any one of claim 1 ~ 24, wherein, when preparing the coal of individual plants, adjusts seepage distance by multiple coal mixing different for the place of production.

The preparation method of 26. coal for coke production according to any one of claim 1 ~ 24, wherein, to be placed in coal by the temperature more than normal temperature and to comprise O ₂, CO ₂, H ₂process in the atmosphere of more than one compositions in O, the seepage distance adjusting this coal makes it reduce.

The preparation method of 27. coal for coke production according to claim 26, wherein, described process is carried out under treatment temperature 100 DEG C ~ 300 DEG C, 1 ~ 120 minute processing time.

The preparation method of 28. coal for coke production according to claim 27, wherein, described process is carried out under treatment temperature 180 DEG C ~ 200 DEG C, 1 ~ 30 minute processing time.